Hey!
So traditionally, Architecture applicants take Maths, Physics and Art. You've mentioned that Maths at GCSE is not your preferred subject but may take it to boost your chances - Maths at A level is significantly more challenging compared to GCSE and requires a good, foundational maths skill. Otherwise, I'm afraid that you would struggle quite a bit (even more so for Physics, which is even more challenging, time-consuming and maths/ problem-solving heavy).
On the bright side, as Architecture is so interdisciplinary, subject choices can be relatively flexible! You'll find that for UK universities, they generally don't have specific subjects that are required, though some like Bath do prefer Maths and/ or Physics more. If you believe that Maths and Physics are completely out of the question, there may be some workarounds.
You said that you really enjoy GCSE Geography - A level geography may be a good choice as not only is it an essay based subject that is generally well regarded by universities, you'll be able to do well and enjoy it! Geography at A level is covered in a lot more depth for both physical and human, so I'm sure you'll have fun 🙂 It also links in with Architecture for some aspects, so it is somewhat relevant
I would definitely recommend Art A level as one of your subjects. This would help a lot for your portfolio and general art skills, as you would be able to gain a formal perspective alongside what you've done in your free time. So this is a top priority (though it's not a dealbreaker if you don't have it when you apply, it just means a lot more work).
How do you feel about other STEM and humanities subjects?